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9.6

How can I pass a schema name as a parameter in a PostgreSQL Function?

Asked by bhardage in PostgreSQL Database

Tags: PostgreSQL, Function, Stored Procedure

Basically I want to pass a schema name as a parameter to a stored procedure, and make a select statement based on that schema name. This is what I've got:

CREATE OR REPLACE FUNCTION myFunction( schemaName "varchar" )
  RETURNS "numeric" AS
$BODY$
DECLARE
      temp numeric;
BEGIN
      SELECT count(*) INTO temp
      FROM schemaName.myTable

      RETURN temp;
END;
$BODY$
  LANGUAGE 'plpgsql' VOLATILE;

The problem is that the query tries to look for a schema named "schemaName" instead of using the value of the variable schemaName.

I've also tried the following:

CREATE OR REPLACE FUNCTION myFunction( schemaName "varchar" )
  RETURNS "numeric" AS
$BODY$
DECLARE
      temp numeric;
BEGIN
      EXECUTE
      'SELECT count(*) INTO temp
      FROM ' || schemaName || '.myTable'

      RETURN temp;
END;
$BODY$
  LANGUAGE 'plpgsql' VOLATILE;

This would work, except I'm using EnterpriseDB version 8.1, so an EXECUTE...INTO statement hasn't been implemented yet.

The problem is that I'm going to be creating many different schemas with the same table structure that use this function, and I could create a stored procedure for each one, but that just seems like a lot of duplicate code to me. (The real stored procedure is much larger)

Any suggestions would be appreciated.

Thanks,
B.J.
[+][-]09/11/09 01:40 PM, ID: 25313296Accepted Solution

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About this solution

Zone: PostgreSQL Database
Tags: PostgreSQL, Function, Stored Procedure
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Solution Provided By: cminear
Participating Experts: 1
Solution Grade: A
 
 
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